vCenterServer FQDN does not match DNS when upgrading vCenter Appliance from 5.5 to 6.0

Thanks to the vExpert program I have some new licenses for my lab systems. Since I only have vCenter 6 Standard licenses and my current vCenter Appliance is running 5.5, I need to upgrade to 6.0. I found a great walkthrough article on the VMware site that I followed. During step 4 of the appliance deployment, the wizard goes out to confirm communication to the existing 5.5 appliance. I ran across the following error and could not proceed: